Model Pique is an add-on that does exactly this and has been around for awhile. Blizzard has just "absorbed" it into the base program.
oo me likey
Urgh, finally. I still try to do this every time. I CTRL clicked twice today trying to look at the raptor mount from ZA/ZG (I forget which one it is) from the dungeon journal.
Separated between mount and player while player afk maybe?
*Claps* Finally! I've been waiting for this for years.
You know what we need more? The ability to sort the list into flying and not flying etc. And to have some kind of interface that is per character so I don't need to keep several macros of mounts.
I don't have any for transmogs... Rares and exotics and I still can't go and tame that cool new rare I see without going through some really annoying activity to grab the one I'd abandon... 50 sounds like a lot, and in the end, it's Blizzard's game, but I'm not sure why they don't extend it... Hell, they eventually extended the number of minipets you can collect, and there literally is no way to fill up the previous cap with unique pets... There's plenty of ways to do that with the hunter pets...
We can already do this in the collection pages. All mounts and pets are there, even ones not collected. Complete info for pets also.
Jesus, finally.